public Node CalcHitNode(Point mousepoint)
{
int hitrow = CalcHitRow(mousepoint);
if (hitrow < 0)
{
return(null);
}
return(NodeCollection.GetNextNode(m_firstVisibleNode, hitrow));
}
void OnVScroll(object sender, ScrollEventArgs e)
{
int diff = e.NewValue - e.OldValue;
//assumedScrollPos += diff;
if (e.NewValue == 0)
{
m_firstVisibleNode = Nodes.FirstNode;
diff = 0;
}
m_firstVisibleNode = NodeCollection.GetNextNode(m_firstVisibleNode, diff);
Invalidate();
}
public void RecalcLayout()
{
if (m_firstVisibleNode == null)
{
m_firstVisibleNode = Nodes.FirstNode;
}
if (Nodes.Count == 0)
{
m_firstVisibleNode = null;
}
UpdateScrollBars();
int vscroll = VScrollValue();
if (vscroll == 0)
{
m_firstVisibleNode = Nodes.FirstNode;
}
else
{
m_firstVisibleNode = NodeCollection.GetNextNode(Nodes.FirstNode, vscroll);
}
Invalidate();
}
protected override void OnKeyDown(KeyEventArgs e)
{
Node newnode = null;
if (e.KeyCode == Keys.PageUp)
{
int remainder = 0;
int diff = MaxVisibleRows(out remainder) - 1;
newnode = NodeCollection.GetNextNode(FocusedNode, -diff);
if (newnode == null)
{
newnode = Nodes.FirstVisibleNode();
}
}
if (e.KeyCode == Keys.PageDown)
{
int remainder = 0;
int diff = MaxVisibleRows(out remainder) - 1;
newnode = NodeCollection.GetNextNode(FocusedNode, diff);
if (newnode == null)
{
newnode = Nodes.LastVisibleNode(true);
}
}
if (e.KeyCode == Keys.Down)
{
newnode = NodeCollection.GetNextNode(FocusedNode, 1);
}
if (e.KeyCode == Keys.Up)
{
newnode = NodeCollection.GetNextNode(FocusedNode, -1);
}
if (e.KeyCode == Keys.Home)
{
newnode = Nodes.FirstNode;
}
if (e.KeyCode == Keys.End)
{
newnode = Nodes.LastVisibleNode(true);
}
if (e.KeyCode == Keys.Left)
{
if (FocusedNode != null)
{
if (FocusedNode.Expanded)
{
FocusedNode.Collapse();
EnsureVisible(FocusedNode);
return;
}
if (FocusedNode.Parent != null)
{
FocusedNode = FocusedNode.Parent;
EnsureVisible(FocusedNode);
}
}
}
if (e.KeyCode == Keys.Right)
{
if (FocusedNode != null)
{
if (FocusedNode.Expanded == false && FocusedNode.HasChildren)
{
FocusedNode.Expand();
EnsureVisible(FocusedNode);
return;
}
if (FocusedNode.Expanded == true && FocusedNode.HasChildren)
{
FocusedNode = FocusedNode.Nodes.FirstNode;
EnsureVisible(FocusedNode);
}
}
}
if (newnode != null)
{
if (MultiSelect)
{
// tree behavior is
// keys none, the selected node is added as the focused and selected node
// keys control, only focused node is moved, the selected nodes collection is not modified
// keys shift, selection from first selected node to current node is done
if (Control.ModifierKeys == Keys.Control)
{
FocusedNode = newnode;
}
else
{
MultiSelectAdd(newnode, Control.ModifierKeys);
}
}
else
{
FocusedNode = newnode;
}
EnsureVisible(FocusedNode);
}
base.OnKeyDown(e);
}
